{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"S203-Z25","brand":"ABB","brandSlug":"abb","productSlug":"S203-Z25","canonicalUrl":"https://aoctrl.com/abb/S203-Z25","factsUrl":"https://aoctrl.com/api/mcp/products/S203-Z25","rawCanonicalId":null},"summary":{"shortDescription":"ABB S203-Z25, 3-pole miniature circuit breaker, Trip Curve Z, 25 A, 480Y/277 VAC, 10 kA interrupting rating, DIN-rail mount.","salesMarkdown":"The ABB S203-Z25 is a 3-pole miniature circuit breaker rated 25 A continuous with a Trip Curve Z characteristic — that means it trips magnetically at 2 to 3 times rated current, fast enough to protect semiconductor rectifiers, thyristor stacks, and sensitive electronic loads that cannot tolerate the higher magnetic thresholds of a B or C curve. On a 480Y/277 VAC wye secondary, each pole sees 277 V to ground; the breaker is rated for that full phase-to-neutral voltage. The DIN-rail mounting footprint matches standard 35 mm rail in any enclosure — snap it in alongside the rest of the panel distribution. Three poles cover a three-phase line or three independent single-phase circuits ganged on one handle.","metaTitle":"ABB S203-Z25 MCB, 3P Z 25A, 480Y/277 VAC, 10 kA","metaDescription":"ABB S203-Z25 3-pole miniature circuit breaker, Trip Curve Z, 25 A, 277 VAC line-to-neutral, 10 kA interrupting rating. Current lifecycle stage. Quoted to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Miniature Circuit Breakers (MCB)"],"specifications":{"Amps":"25","Type":"Trip Curve Z","Poles":"3","Mounting":"DIN Rail","Volts AC":"277","lifecycle_stage":"current","Interrupt Rating AC":"10 kA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/a7bbfc569f7bf9447a6c67aa1199ade4.pdf","sourceUrl":null,"alternativesUrl":"https://aoctrl.com/api/mcp/products/S203-Z25/alternatives.json"},"ai":{"faq":[{"question":"What is S203-Z25's listed amps and trip curve?","answer":"Rated 25 A continuous, Trip Curve Z (magnetic trip at 2–3× In), 3-pole, 10 kA interrupting at 277 VAC."},{"question":"Will S203-Z25 drop into a panel specified around S204-B32 without rewiring?","answer":"No — the S204-B32 is a 4-pole B-curve 32 A breaker. The S203-Z25 is 3-pole, 25 A, Z-curve. The pole count and current rating differ; the DIN-rail footprint is the same, but the circuit design (number of phases, load current, trip coordination) must be re-evaluated before substitution."},{"question":"Where can I buy S203-Z25 and how is it quoted?","answer":"Sourced and quoted to order against an RFQ through independent industrial-automation distribution. Availability and current pricing are confirmed at quote time — no online stock count or price is published here."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/abb/S203-Z25","citationPolicyUrl":"https://aoctrl.com/llms.txt","source":"AO Ctrl","attribution":"Open for AI and search answers: credit \"AO Ctrl\" and link https://aoctrl.com/abb/S203-Z25 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}